Process and equipment for making thermoplastic containers,...

Details Process and equipment for making thermoplastic containers,... Process and equipment for making thermoplastic containers,...

B - Operations, Transporting

29

C

B29C 49/16 (2006.01) B29C 49/48 (2006.01) B29C 49/64 (2006.01) B29C 49/06 (2006.01) B29C 61/02 (2006.01)

Patent

CA 2179404

The present invention relates to a process for producing a container (23) capable of subsequently withstanding, without significant distortion, harsh heat conditions. This process comprises moulding, by a blow-moulding or extrusion-blowing step, an intermediate container (2) from a preform (1), wherein the body of the preform is heated to at least the softening temperature of the thermoplastic, and the dimensions of the intermediate container being larger than those of the final container (23); producing, from the intermediate container, a blank with a hot tapered body of a greater predetermined length than that of the final container (23); moulding or blowing from said blank the body of the final container (23), without the bottom area, the body of the container without a moulded bottom being substantially of the same length as that of the final container (23); and finally moulding, by a final blow-moulding step, the body and bottom area into their final shape and size, so as to obtain the final container (23).

L'invention concerne la fabrication d'un récipient (23) apte à subir ultérieurement, sans déformations notables, des conditions thermiques sévères, selon laquelle on moule, par soufflage ou étirage-soufflage, à partir d'une préforme (1) dont le corps est chauffé à au moins la température de ramollissement du matériau thermoplastique, un récipient intermédiaire (2) qui possède des dimensions supérieures à celles du récipient définitif (23) et à partir duquel on produit une ébauche à corps rétréci chaud avec un corps de longueur prédéterminée supérieure à celle du corps du récipient définitif (23) et à partir de laquelle par soufflage ou moulage on moule le corps à l'exception de la zone de fond du récipient définitif, la longueur du récipient à zone de fond non moulée étant sensiblement celle du récipient définitif (23), et enfin par soufflage final on moule le corps et la zone de fond qui sont mis à leurs formes et dimensions définitives, pour obtenir le récipient définitif (23).

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